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lennox 80uhg3/4-100a-2 surefire board - 2 alternate fast

Customer Question
lennox 80uhg3/4-100a-2 surefire board - 2...
lennox 80uhg3/4-100a-2

surefire board - 2 alternate fast flashing leds

checked all conditions in service manual

heater does not start
Submitted: 7 years ago.Category: HVAC
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Answered in 2 hours by:
3/17/2010
HVAC Technician: Charles, HVAC Contractor replied 7 years ago
Charles
Charles, HVAC Contractor
Category: HVAC
Satisfied Customers: 69
Experience: State Lic. HVAC Contractor. 20 yrs field exp. Repairs and installtions.
Verified

Hello

maybe I can help

 

The flashing led is a error code if you look on the inside of the access panels one may have a schematic with the diagnostic codes listed on a chart that will tell you what the code means. like pressure switch failure, or maybe ignition failure, Flame sense failure and so on there will be more codes than that those are just a few of what they might be.

 

If not describe just what it does and doesn't do besides light do and I will try to help you

 

for example does the combustion/ inducer fan start does the igniter glow/spark and so on. the more you tell me the better I can help.

 

if I can help you further let me know



Edited by Charles on 3/17/2010 at 8:39 AM EST
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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,760
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Verified

 

Page 7 here gives broken ignitor as a possible cause of alternate fast flashing.

 

The ignitor is the most common part to fail. Check the ignitor first and go from there.

 

See page 7 here - http://www.cozyparts.com/Lennox-Parts/forum/Lennox_service_manual/Furnaces/80UHG_01-01-2002.pdf

 

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Customer reply replied 7 years ago
The ignitor measures 15 ohms which is within the 10-19 ohm range. The inducer fan does not start and the ignitor does not glow.
HVAC Technician: Charles, HVAC Contractor replied 7 years ago

It seem's some here Are quick to sell parts without knowing the real problem 1st.


 


the inducer fan/ combustion air fan has to start 1st.


if it doesnt you need to look at other issues 1st. not the igniter.


 


Just Like to keep the customers open to the correct way to go about troubleshooting.


 


Ask questions1st answer after informed without throwing the wrong parts at the problem.


 


Thank you and if I can assist you further I would be happy too. Please read my signature at the bottom of my post Thank you!!!

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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 7 years ago

 

The Surelight control board monitors ignition lines, ignitor and ground before pressure switch makes . Thus the recommendation given by Lennox, with that code, is to start with the ignition components.

 

With the proper service manual, you can make better head way in diagnosing the diagnostic blink code.

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HVAC Technician: Charles, HVAC Contractor replied 7 years ago

Just remember YOU DO NOT have to accept any answer. Until you are satisfied

 

I was just trying to help you help yourself I could easily throw some documents at you too. But from experience have seen control boards Give false codes when they are the problem and have seen them give no code and the control was still bad. Real world hands on experience. I am a Owner operator Of my Own HVAC company which means I go out in the field daily and make repairs on problems just like this all the time.

 

But not being there to see for my self I have to rely on good information to make the proper diagnosis. and do not jump to conclusions without all the facts.

 

I am not saying the control Module Is Bad nor to run out and replace it. Just trying to get Well Informed 1st. Your problem code could be valid. if it is that would make the repair very easy. I hope it is accurate for your sake igniter's are much less expensive than control modules

 

If you would prefer I will opt out so Billy can lead you on.

 

Just let me know thank you and have a wonderful day.

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Customer reply replied 7 years ago
I pretty sure neither of you will be able to further assist without hands on. Thanks for trying.
HVAC Technician: Charles, HVAC Contractor replied 7 years ago

Not a problem hope you get your problem solved. and yes hands on is the best way when possible. and affordable

 

I think you have made a wise choice.

 

Good luck and have a Nice day.

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HVAC Technician: Regan Land, HVAC Technician replied 7 years ago
Regan Land
Regan Land, HVAC Technician
Category: HVAC
Satisfied Customers: 707
Experience: Over 20 years of experience, NATE Certified, Licensed HVAC Contractor, Certified IAQ Specialist
Verified

Hello. Welcome to JustAnswer.com. My name is XXXXX XXXXX I'll be happy to assist you today.

 

The alternating slow flash is a code telling us that the burners failed to ignite. That can be caused by a number of problems including the hot surface igniter. I see you have ohmed it out and it tested good, so we need to look further.

 

When the board is flashing this code, it is in a 60 minute 'Watchguard' period. We can reset the board by unplugging the furnace and plugging back in.

 

After doing so, what steps does the furnace go through?

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Regan Land
Regan Land
Regan Land, HVAC Technician
Category: HVAC
Satisfied Customers: 707
707 Satisfied Customers
Experience: Over 20 years of experience, NATE Certified, Licensed HVAC Contractor, Certified IAQ Specialist

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